I am F years old and my brother is B years older. What is the sum of our ages? What will be the sum of our ages in 3 years? What was the difference of our ages 3 years ago?
Assuming that the variables are only F and B then the sun would simply be: F+b The sum in 3 years is: (F+3)+(B+3) Lastly the difference 3 years ago would be: (F-3)-(B+3)